/*
 * jdbc-trace-wrapper
 * Copyright (C) 2010. The jdbc-trace-wrapper Project
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package nz.jdbcwrapper;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLWarning;
import java.sql.BatchUpdateException;

class WrapperStatement extends WarningHolder implements Statement
{
  private final Statement statement;
  Statistic statistic;
  final Data data;
  private boolean closed = false;

  static final protected String STATEMENT = "statement";
  static final protected String CALLABLE_STATEMENT = "CallableStatement";
  static final protected String PREPARED_STATEMENT = "PreparedStatement";

  WrapperStatement(Data data,
                   Statistic statistic,
                   Statement statement)
  {
    super("[" + data.connection.id + "]");
    this.data = data;
    this.statistic = statistic;
    this.statement = statement;
  }

  /**
   * Executes an SQL statement that returns a single <code>ResultSet</code> object.
   *
   * @param sql typically this is a static SQL <code>SELECT</code> statement
   * @return a <code>ResultSet</code> object that contains the data produced by the
   * given query; never <code>null</code>
   * @exception SQLException if a database access error occurs
   */
  public ResultSet executeQuery(String sql) throws SQLException
  {
    statistic = Util.register(sql);
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " executeQuery(" + Util.toString(sql, 2000, 0) + ")");

    long start = 0;
    long duration = Long.MIN_VALUE;
    WrapperResultSet result;
    SQLException excp;

    try
    {
      start = System.currentTimeMillis();
      ResultSet resultSet = statement.executeQuery(sql);
      duration = System.currentTimeMillis() - start;
      result = WrapperResultSet.build(data,this, statistic, prefix, resultSet);

      if (data.trace >= 3)
        Util.traceEnd(key, result.prefix);

      return result;
    }
    catch (SQLException e)
    {
      duration = System.currentTimeMillis() - start;
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      excp = e;
    }
    finally
    {
      statistic.execution(duration);
      checkWarnings();
    }
    throw excp;
  }

  /**
   * Executes an SQL <code>INSERT</code>, <code>UPDATE</code> or
   * <code>DELETE</code> statement. In addition,
   * SQL statements that return nothing, such as SQL DDL statements,
   * can be executed.
   *
   * @param sql an SQL <code>INSERT</code>, <code>UPDATE</code> or
   * <code>DELETE</code> statement or an SQL statement that returns nothing
   * @return either the row count for <code>INSERT</code>, <code>UPDATE</code>
   * or <code>DELETE</code> statements, or 0 for SQL statements that return nothing
   * @exception SQLException if a database access error occurs
   */
  public int executeUpdate(String sql) throws SQLException
  {
    statistic = Util.register(sql);
    long key = 0;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " executeUpdate(" + Util.toString(sql, 4000, 0) + ")");
    long start = 0;
    long end = 0;
    int result;

    try
    {
      start = System.currentTimeMillis();
      result = statement.executeUpdate(sql);
      end = System.currentTimeMillis() - start;

      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(result));
      key = 0;
    }
    catch (SQLException e)
    {
      end = System.currentTimeMillis() - start;
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      key = 0;
      throw e;
    }
    finally
    {
      if (end == 0) {
        end = System.currentTimeMillis() - start;
      }
      if (data.trace >= 3 && key != 0)
        Util.traceEnd(key, "!!");

      statistic.execution(end);
      checkWarnings();
    }

    return result;
  }

  /**
   * Releases this <code>Statement</code> object's database
   * and JDBC resources immediately instead of waiting for
   * this to happen when it is automatically closed.
   * It is generally good practice to release resources as soon as
   * you are finished with them to avoid tying up database
   * resources.
   * <P><B>Note:</B> A <code>Statement</code> object is automatically closed when it is
   * garbage collected. When a <code>Statement</code> object is closed, its current
   * <code>ResultSet</code> object, if one exists, is also closed.
   *
   * @exception SQLException if a database access error occurs
   */
  public void close() throws SQLException
  {
    long key = 0;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " close()");

    try
    {
      closed = true;
      statement.close();

      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  //----------------------------------------------------------------------

  /**
   * Returns the maximum number of bytes allowed
   * for any column value.
   * This limit is the maximum number of bytes that can be
   * returned for any column value.
   * The limit applies only to <code>BINARY</code>,
   * <code>VARBINARY</code>, <code>LONGVARBINARY</code>, <code>CHAR</code>, <code>VARCHAR</code>, and <code>LONGVARCHAR</code>
   * columns.  If the limit is exceeded, the excess data is silently
   * discarded.
   *
   * @return the current max column size limit; zero means unlimited
   * @exception SQLException if a database access error occurs
   */
  public int getMaxFieldSize() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getMaxFieldSize()");

    try
    {
      int size = statement.getMaxFieldSize();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(size));
      return size;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Sets the limit for the maximum number of bytes in a column to
   * the given number of bytes.  This is the maximum number of bytes
   * that can be returned for any column value.  This limit applies
   * only to <code>BINARY</code>, <code>VARBINARY</code>,
   * <code>LONGVARBINARY</code>, <code>CHAR</code>, <code>VARCHAR</code>, and
   * <code>LONGVARCHAR</code> fields.  If the limit is exceeded, the excess data
   * is silently discarded. For maximum portability, use values
   * greater than 256.
   *
   * @param max the new max column size limit; zero means unlimited
   * @exception SQLException if a database access error occurs
   */
  public void setMaxFieldSize(int max) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setMaxFieldSize(" + max + ")");

    try
    {
      statement.setMaxFieldSize(max);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the maximum number of rows that a
   * <code>ResultSet</code> object can contain.  If the limit is exceeded, the excess
   * rows are silently dropped.
   *
   * @return the current max row limit; zero means unlimited
   * @exception SQLException if a database access error occurs
   */
  public int getMaxRows() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getMaxRows()");

    try
    {
      int rows = statement.getMaxRows();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(rows));
      return rows;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Sets the limit for the maximum number of rows that any
   * <code>ResultSet</code> object can contain to the given number.
   * If the limit is exceeded, the excess
   * rows are silently dropped.
   *
   * @param max the new max rows limit; zero means unlimited
   * @exception SQLException if a database access error occurs
   */
  public void setMaxRows(int max) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setMaxRows(" + max + ")");

    try
    {
      statement.setMaxRows(max);

      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Sets escape processing on or off.
   * If escape scanning is on (the default), the driver will do
   * escape substitution before sending the SQL to the database.
   *
   * Note: Since prepared statements have usually been parsed prior
   * to making this call, disabling escape processing for prepared
   * statements will have no effect.
   *
   * @param enable <code>true</code> to enable; <code>false</code> to disable
   * @exception SQLException if a database access error occurs
   */
  public void setEscapeProcessing(boolean enable) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setEscapeProcessing(" + enable + ")");

    try
    {
      statement.setEscapeProcessing(enable);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the number of seconds the driver will
   * wait for a <code>Statement</code> object to execute. If the limit is exceeded, a
   * <code>SQLException</code> is thrown.
   *
   * @return the current query timeout limit in seconds; zero means unlimited
   * @exception SQLException if a database access error occurs
   */
  public int getQueryTimeout() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getQueryTimeout()");

    try
    {
      int queryTimeout = statement.getQueryTimeout();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(queryTimeout));
      return queryTimeout;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Sets the number of seconds the driver will
   * wait for a <code>Statement</code> object to execute to the given number of seconds.
   * If the limit is exceeded, an <code>SQLException</code> is thrown.
   *
   * @param seconds the new query timeout limit in seconds; zero means
   * unlimited
   * @exception SQLException if a database access error occurs
   */
  public void setQueryTimeout(int seconds) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setQueryTimeout(" + seconds + ")");

    try
    {
      statement.setQueryTimeout(seconds);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Cancels this <code>Statement</code> object if both the DBMS and
   * driver support aborting an SQL statement.
   * This method can be used by one thread to cancel a statement that
   * is being executed by another thread.
   *
   * @exception SQLException if a database access error occurs
   */
  public void cancel() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " cancel()");

    try
    {
      statement.cancel();
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the first warning reported by calls on this <code>Statement</code> object.
   * Subsequent <code>Statement</code> object warnings will be chained to this
   * <code>SQLWarning</code> object.
   *
   * <p>The warning chain is automatically cleared each time
   * a statement is (re)executed.
   *
   * <P><B>Note:</B> If you are processing a <code>ResultSet</code> object, any
   * warnings associated with reads on that <code>ResultSet</code> object
   * will be chained on it.
   *
   * @return the first <code>SQLWarning</code> object or <code>null</code>
   * @exception SQLException if a database access error occurs
   */
  public SQLWarning getWarnings() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getWarnings()");

    try
    {
      SQLWarning warning = statement.getWarnings();
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
      return warning;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Clears all the warnings reported on this <code>Statement</code>
   * object. After a call to this method,
   * the method <code>getWarnings</code> will return
   * <code>null</code> until a new warning is reported for this
   * <code>Statement</code> object.
   *
   * @exception SQLException if a database access error occurs
   */
  public void clearWarnings() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " clearWarnings()");

    try
    {
      statement.clearWarnings();
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
      warnings.clear();
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Defines the SQL cursor name that will be used by
   * subsequent <code>Statement</code> object <code>execute</code> methods.
   * This name can then be
   * used in SQL positioned update/delete statements to identify the
   * current row in the <code>ResultSet</code> object generated by this statement.  If
   * the database doesn't support positioned update/delete, this
   * method is a noop.  To insure that a cursor has the proper isolation
   * level to support updates, the cursor's <code>SELECT</code> statement should be
   * of the form 'select for update ...'. If the 'for update' phrase is
   * omitted, positioned updates may fail.
   *
   * <P><B>Note:</B> By definition, positioned update/delete
   * execution must be done by a different <code>Statement</code> object than the one
   * which generated the <code>ResultSet</code> object being used for positioning. Also,
   * cursor names must be unique within a connection.
   *
   * @param name the new cursor name, which must be unique within
   *             a connection
   * @exception SQLException if a database access error occurs
   */
  public void setCursorName(String name) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setCursorName(" + Util.toString(name) + ")");

    try
    {
      statement.setCursorName(name);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  //----------------------- Multiple Results --------------------------

  /**
   * Executes an SQL statement that may return multiple results.
   * Under some (uncommon) situations a single SQL statement may return
   * multiple result sets and/or update counts.  Normally you can ignore
   * this unless you are (1) executing a stored procedure that you know may
   * return multiple results or (2) you are dynamically executing an
   * unknown SQL string.  The  methods <code>execute</code>,
   * <code>getMoreResults</code>, <code>getResultSet</code>,
   * and <code>getUpdateCount</code> let you navigate through multiple results.
   *
   * The <code>execute</code> method executes an SQL statement and indicates the
   * form of the first result.  You can then use the methods
   * <code>getResultSet</code> or <code>getUpdateCount</code>
   * to retrieve the result, and <code>getMoreResults</code> to
   * move to any subsequent result(s).
   *
   * @param sql any SQL statement
   * @return <code>true</code> if the next result is a <code>ResultSet</code> object;
   * <code>false</code> if it is an update count or there are no more results
   * @exception SQLException if a database access error occurs
   * @see #getResultSet
   * @see #getUpdateCount
   * @see #getMoreResults
   */
  public boolean execute(String sql) throws SQLException
  {
    statistic = Util.register(sql);
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " execute(" + Util.toString(sql, 8000, 0) + ")");

    long start = 0;
    long duration = Long.MIN_VALUE;
    boolean result;
    SQLException excp = null;

    try
    {
      start = System.currentTimeMillis();
      result = statement.execute(sql);
      duration = System.currentTimeMillis() - start;

      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(result));
      return result;
    }
    catch (SQLException e)
    {
      duration = System.currentTimeMillis() - start;
      excp = e;
      if (data.trace >= 3)
        Util.traceEnd(key, e);
    }
    finally
    {
      if (duration == Long.MIN_VALUE)
        duration = System.currentTimeMillis() - start;

      statistic.execution(duration);
      checkWarnings();
    }

    throw excp;
  }

  /**
   *  Returns the current result as a <code>ResultSet</code> object.
   *  This method should be called only once per result.
   *
   * @return the current result as a <code>ResultSet</code> object;
   * <code>null</code> if the result is an update count or there are no more results
   * @exception SQLException if a database access error occurs
   * @see #execute
   */
  public ResultSet getResultSet() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getResultSet()");

    try
    {
      ResultSet realResult = statement.getResultSet();
      if (realResult == null)
      {
        if (data.trace >= 3)
          Util.traceEnd(key, "null");
        return null;
      }

      WrapperResultSet result = WrapperResultSet.build(
        data, this, statistic, prefix, realResult);

      if (data.trace >= 3)
        Util.traceEnd(key, result.prefix);

      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }


  /**
   *  Returns the current result as an update count;
   *  if the result is a <code>ResultSet</code> object or there are no more results, -1
   *  is returned. This method should be called only once per result.
   *
   * @return the current result as an update count; -1 if the current result is a
   * <code>ResultSet</code> object or there are no more results
   * @exception SQLException if a database access error occurs
   * @see #execute
   */
  public int getUpdateCount() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getUpdateCount()");

    try
    {
      int updateCount = statement.getUpdateCount();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(updateCount));
      return updateCount;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Moves to a <code>Statement</code> object's next result.  It returns
   * <code>true</code> if this result is a <code>ResultSet</code> object.
   * This method also implicitly closes any current <code>ResultSet</code>
   * object obtained with the method <code>getResultSet</code>.
   *
   * <P>There are no more results when the following is true:
   * <PRE>
   *      <code>(!getMoreResults() && (getUpdateCount() == -1)</code>
   * </PRE>
   *
   * @return <code>true</code> if the next result is a <code>ResultSet</code> object;
   * <code>false</code> if it is an update count or there are no more results
   * @exception SQLException if a database access error occurs
   * @see #execute
   */
  public boolean getMoreResults() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getMoreResults()");

    try
    {
      boolean moreResults = statement.getMoreResults();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(moreResults));
      return moreResults;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }


  //--------------------------JDBC 2.0-----------------------------


  /**
   * Gives the driver a hint as to the direction in which
   * the rows in a result set
   * will be processed. The hint applies only to result sets created
   * using this <code>Statement</code> object.  The default value is
   * <code>ResultSet.FETCH_FORWARD</code>.
   * <p>Note that this method sets the default fetch direction for
   * result sets generated by this <code>Statement</code> object.
   * Each result set has its own methods for getting and setting
   * its own fetch direction.
   * @param direction the initial direction for processing rows
   * @exception SQLException if a database access error occurs
   * or the given direction
   * is not one of <code>ResultSet.FETCH_FORWARD</code>,
   * <code>ResultSet.FETCH_REVERSE</code>, or <code>ResultSet.FETCH_UNKNOWN</code>
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public void setFetchDirection(int direction) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setFetchDirection(" + direction + ")");

    try
    {
      statement.setFetchDirection(direction);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the direction for fetching rows from
   * database tables that is the default for result sets
   * generated from this <code>Statement</code> object.
   * If this <code>Statement</code> object has not set
   * a fetch direction by calling the method <code>setFetchDirection</code>,
   * the return value is implementation-specific.
   *
   * @return the default fetch direction for result sets generated
   *          from this <code>Statement</code> object
   * @exception SQLException if a database access error occurs
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public int getFetchDirection() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getFetchDirection()");

    try
    {
      int fetchDirection = statement.getFetchDirection();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(fetchDirection));
      return fetchDirection;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Gives the JDBC driver a hint as to the number of rows that should
   * be fetched from the database when more rows are needed.  The number
   * of rows specified affects only result sets created using this
   * statement. If the value specified is zero, then the hint is ignored.
   * The default value is zero.
   *
   * @param rows the number of rows to fetch
   * @exception SQLException if a database access error occurs, or the
   * condition 0 <= rows <= this.getMaxRows() is not satisfied.
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public void setFetchSize(int rows) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " setFetchSize(" + rows + ")");

    try
    {
      statement.setFetchSize(rows);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the number of result set rows that is the default
   * fetch size for result sets
   * generated from this <code>Statement</code> object.
   * If this <code>Statement</code> object has not set
   * a fetch size by calling the method <code>setFetchSize</code>,
   * the return value is implementation-specific.
   * @return the default fetch size for result sets generated
   *          from this <code>Statement</code> object
   * @exception SQLException if a database access error occurs
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public int getFetchSize() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getFetchSize()");

    try
    {
      int fetchSize = statement.getFetchSize();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(fetchSize));
      return fetchSize;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the result set concurrency for <code>ResultSet</code> objects
   * generated by this <code>Statement</code> object.
   *
   * @return either <code>ResultSet.CONCUR_READ_ONLY</code> or
   * <code>ResultSet.CONCUR_UPDATABLE</code>
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public int getResultSetConcurrency() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getResultSetConcurrency()");

    try
    {
      int resultSetConcurrency = statement.getResultSetConcurrency();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(resultSetConcurrency));
      return resultSetConcurrency;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Retrieves the result set type for <code>ResultSet</code> objects
   * generated by this <code>Statement</code> object.
   *
   * @return one of <code>ResultSet.TYPE_FORWARD_ONLY</code>,
   * <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
   * <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public int getResultSetType()  throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getResultSetType()");

    try
    {
      int resultSetType = statement.getResultSetType();
      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(resultSetType));
      return resultSetType;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Adds an SQL command to the current batch of commmands for this
   * <code>Statement</code> object. This method is optional.
   *
   * @param sql typically this is a static SQL <code>INSERT</code> or
   * <code>UPDATE</code> statement
   * @exception SQLException if a database access error occurs, or the
   * driver does not support batch statements
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public void addBatch(String sql) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " addBatch(" + Util.toString(sql, 4000, 0) + ")");

    try
    {
      statement.addBatch(sql);
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Makes the set of commands in the current batch empty.
   * This method is optional.
   *
   * @exception SQLException if a database access error occurs or the
   * driver does not support batch statements
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public void clearBatch() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " clearBatch()");

    try
    {
      statement.clearBatch();
      if (data.trace >= 3)
        Util.traceEnd(key, (String)null);
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * Submits a batch of commands to the database for execution and
   * if all commands execute successfully, returns an array of update counts.
   * The <code>int</code> elements of the array that is returned are ordered
   * to correspond to the commands in the batch, which are ordered
   * according to the order in which they were added to the batch.
   * The elements in the array returned by the method <code>executeBatch</code>
   * may be one of the following:
   * <OL>
   * <LI>A number greater than or equal to zero -- indicates that the
   * command was processed successfully and is an update count giving the
   * number of rows in the database that were affected by the command's
   * execution
   * <LI>A value of <code>-2</code> -- indicates that the command was
   * processed successfully but that the number of rows affected is
   * unknown
   * <P>
   * If one of the commands in a batch update fails to execute properly,
   * this method throws a <code>BatchUpdateException</code>, and a JDBC
   * driver may or may not continue to process the remaining commands in
   * the batch.  However, the driver's behavior must be consistent with a
   * particular DBMS, either always continuing to process commands or never
   * continuing to process commands.  If the driver continues processing
   * after a failure, the array returned by the method
   * <code>BatchUpdateException.getUpdateCounts</code>
   * will contain as many elements as there are commands in the batch, and
   * at least one of the elements will be the following:
   * <P>
   * <LI>A value of <code>-3</code> -- indicates that the command failed
   * to execute successfully and occurs only if a driver continues to
   * process commands after a command fails
   * </OL>
   * <P>
   * A driver is not required to implement this method.
   * The possible implementations and return values have been modified in
   * the Java 2 SDK, Standard Edition, version 1.3 to
   * accommodate the option of continuing to proccess commands in a batch
   * update after a <code>BatchUpdateException</code> obejct has been thrown.
   *
   * @return an array of update counts containing one element for each
   * command in the batch.  The elements of the array are ordered according
   * to the order in which commands were added to the batch.
   * @exception SQLException if a database access error occurs or the
   * driver does not support batch statements. Throws {@link BatchUpdateException}
   * (a subclass of <code>SQLException</code>) if one of the commands sent to the
   * database fails to execute properly or attempts to return a result set.
   * @since 1.3
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public int [] executeBatch() throws SQLException
  {
    long key = 0L;
    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " executeBatch()");

    try
    {
      int[] result = statement.executeBatch();

      if (data.trace >= 3)
        Util.traceEnd(key, result == null
                      ? "null"
                      : "int[" + result.length + "]");
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
   }

  /**
   * Returns the <code>Connection</code> object
   * that produced this <code>Statement</code> object.
   * @return the connection that produced this statement
   * @exception SQLException if a database access error occurs
   * @since 1.2
   * @see <a href="package-summary.html#2.0 API">What Is in the JDBC
   *      2.0 API</a>
   */
  public Connection getConnection()  throws SQLException
  {
    if (data.trace >= 3)
      Util.trace(prefix + " getConnection()");
    return data.connection.connection;
  }
  /**
   * @see java.sql.Statement#execute(String, int)
   */
  public boolean execute(String sql, int autoGeneratedKeys) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " execute(" + Util.toString(sql, 4000, 0) + ", " + autoGeneratedKeys + ")");

    try
    {
      boolean result = statement.execute(sql, autoGeneratedKeys);

      if (data.trace >= 3)
        Util.traceEnd(key, Util.toString(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#execute(String, int[])
   */
  public boolean execute(String sql, int[] columnIndexes) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " execute(" + Util.toString(sql, 4000, 0) + ", " + Util.toString(columnIndexes) + ")");

    try
    {
      boolean result = statement.execute(sql, columnIndexes);

      if (data.trace >= 3)
        Util.traceEnd(key, Util.toString(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#execute(String, String[])
   */
  public boolean execute(String sql, String[] columnNames) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " execute(" + Util.toString(sql, 4000, 0) + ", " + Util.toString(columnNames) + ")");

    try
    {
      boolean result = statement.execute(sql, columnNames);

      if (data.trace >= 3)
        Util.traceEnd(key, Util.toString(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#executeUpdate(String, int)
   */
  public int executeUpdate(String sql, int autoGeneratedKeys)
    throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " executeUpdate(" + Util.toString(sql, 4000, 0) + ", " + autoGeneratedKeys + ")");

    try
    {
      int result = statement.executeUpdate(sql, autoGeneratedKeys);

      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#executeUpdate(String, int[])
   */
  public int executeUpdate(String sql, int[] columnIndexes) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " executeUpdate(" + Util.toString(sql, 4000, 0) + ", int[])");

    try
    {
      int result = statement.executeUpdate(sql, columnIndexes);

      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#executeUpdate(String, String[])
   */
  public int executeUpdate(String sql, String[] columnNames)
    throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " executeUpdate(" + Util.toString(sql, 4000, 0) + ", String[])");

    try
    {
      int result = statement.executeUpdate(sql, columnNames);

      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#getGeneratedKeys()
   */
  public ResultSet getGeneratedKeys() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getGeneratedKeys()");

    try
    {
      ResultSet result = statement.getGeneratedKeys();

      if (data.trace >= 3)
        Util.traceEnd(key, Util.toString(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#getMoreResults(int)
   */
  public boolean getMoreResults(int current) throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getMoreResults(" + current + ")");

    try
    {
      boolean result = statement.getMoreResults(current);

      if (data.trace >= 3)
        Util.traceEnd(key, Util.toString(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  /**
   * @see java.sql.Statement#getResultSetHoldability()
   */
  public int getResultSetHoldability() throws SQLException
  {
    long key = 0L;

    if (data.trace >= 3)
      key = Util.traceBegin(prefix + " getResultSetHoldability()");

    try
    {
      int result = statement.getResultSetHoldability();

      if (data.trace >= 3)
        Util.traceEnd(key, String.valueOf(result));
      return result;
    }
    catch (SQLException e)
    {
      if (data.trace >= 3)
        Util.traceEnd(key, e);
      throw e;
    }
    finally
    {
      checkWarnings();
    }
  }

  SQLWarning getProxyWarnings() throws SQLException
  {
    return closed ? null : statement.getWarnings();
  }

//    public boolean isClosed() throws SQLException
//    {
//        long key = 0L;
//
//        if (data.trace >= 3)
//          key = Util.traceBegin(prefix + " isClosed()");
//
//        try
//        {
//          boolean result = statement.isClosed();
//
//          if (data.trace >= 3)
//            Util.traceEnd(key, String.valueOf(result));
//          return result;
//        }
//        catch (SQLException e)
//        {
//          if (data.trace >= 3)
//            Util.traceEnd(key, e);
//          throw e;
//        }
//        finally
//        {
//          checkWarnings();
//        }
//    }
//    
//    public boolean isPoolable() throws SQLException
//    {
//        long key = 0L;
//
//        if (data.trace >= 3)
//          key = Util.traceBegin(prefix + " isPoolable()");
//
//        try
//        {
//          boolean result = statement.isPoolable();
//
//          if (data.trace >= 3)
//            Util.traceEnd(key, String.valueOf(result));
//          return result;
//        }
//        catch (SQLException e)
//        {
//          if (data.trace >= 3)
//            Util.traceEnd(key, e);
//          throw e;
//        }
//        finally
//        {
//          checkWarnings();
//        }
//    }
//    
//    public void setPoolable(boolean poolable) throws SQLException
//    {
//        long key = 0L;
//
//        if (data.trace >= 3)
//          key = Util.traceBegin(prefix + " setPoolable(" + poolable + ")");
//
//        try
//        {
//          statement.setPoolable(poolable);
//          if (data.trace >= 3)
//            Util.traceEnd(key, (String)null);
//        }
//        catch (SQLException e)
//        {
//          if (data.trace >= 3)
//            Util.traceEnd(key, e);
//          throw e;
//        }
//        finally
//        {
//          checkWarnings();
//        }
//    }
//    public boolean isWrapperFor(Class<?> iface) throws SQLException
//    {
//        return iface.isInstance(this) || preparedStatement.isWrapperFor(iface);
//    }
//
//    public <T> T unwrap(Class<T> iface) throws SQLException
//    {
//        return iface.isInstance(this) ? (T)this : preparedStatement.unwrap(iface);
//    }
}
